JPH0590597U - Emergency generator box - Google Patents

Abstract

(57) [Summary] [Purpose] Firstly, the soundproofing performance is improved, and the noise of the prime mover, the generator, etc. is less likely to leak to the outside, and secondly, this increases the wall thickness of the sound absorbing material. The present invention proposes an outer box for an emergency power generator, which can be realized without any structural limitation such as reduction of indoor storage space. [Structure] An outer box 4 of an emergency power generator in which a prime mover 6, a generator 7 and the like are housed, the inner surface of which is covered with a sound absorbing material 8 such as glass wool, and the inner surface of the sound absorbing material 8 is covered. The unevenness 9 that diffusely reflects sound waves is formed. Therefore, firstly, most of the sound waves from the prime mover 6, the generator 7 and the like are absorbed by the sound absorbing material 8, and the reflection on the indoor surface of the sound absorbing material 8 is attenuated by the unevenness 9. As a result, the noise is suppressed to that extent, and it becomes difficult for the noise to leak to the outside. Second
Moreover, this is realized by forming the unevenness 9 on the indoor surface of the sound absorbing material 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an outer box of an emergency power generator. That is, it relates to an outer box of an emergency power generator in which a prime mover, a generator, etc. are housed.

[0002]

[Prior Art]

 FIG. 4 is an enlarged cross-sectional view of the main part of this type of conventional example. In the outer box of the emergency power generator, the inner surface of the outer plate 1 is generally covered with a sound absorbing material 2 in order to suppress noises of a prime mover, a generator and the like and improve soundproof performance. As shown in FIG. 4, conventionally, as such a sound absorbing material 2, a sound absorbing material 2 having a constant wall thickness and a flat surface 3 on the indoor side has been used.

[0003]

[Problems to be solved by the device]

 By the way, the following problems have been pointed out in such a conventional example. That is, firstly, there was a problem that the soundproofing performance was insufficient and the noise of the prime mover, the generator, etc. easily leaked to the outside A. In particular, it was pointed out that the sound wave reflected on the inner side B was likely to leak to the outer side A as noise due to the flat surface 3 on the indoor side surface of the sound absorbing material 2. Secondly, as a countermeasure, it is possible to further increase the wall thickness of the sound absorbing material 2 and thus improve the soundproofing performance. However, if the wall thickness is increased in this way, the storage space of the internal B is reduced. However, there was a natural limit to the structure, and it was not an effective measure.

In view of such circumstances, the present invention has been made to solve the problems of the above-mentioned conventional example, and is to form irregularities for irregularly reflecting sound waves on the indoor surface of the sound absorbing material. , Firstly, we propose an outer box for an emergency power generator, which improves the soundproofing performance and makes it difficult for noise to leak to the outside, and secondly, this is realized without increasing the thickness of the sound absorbing material. The purpose is to do.

[0005]

[Means for Solving the Problems]

 The technical means of the present invention for achieving this object are as follows. In other words, the outer box of this emergency power generator contains the prime mover, generator, etc. inside. The inner surface is covered with a sound absorbing material, and the inner surface of the sound absorbing material is provided with concave and convex portions that diffusely reflect sound waves.

[0006]

[Action]

 Since the present invention comprises such means, it operates as follows. During use, most of the sound waves generated from the internal prime mover, generator, etc. are absorbed while passing through the sound absorbing material, and some of them are not transmitted through the sound absorbing material and are reflected on the indoor surface. However, at that time, the irregularities on the indoor surface are diffusely reflected and attenuated. Therefore, firstly, since the sound wave is absorbed by the sound absorbing material and the reflected component is attenuated as described above, the noise is suppressed and it is difficult to leak to the outside. Secondly, this is achieved by forming irregularities on the chamber inner surface of the sound absorbing material.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. 1, 2 and 3 show an embodiment of the present invention, FIG. 1 is a front sectional view thereof, FIG. 2 is a side sectional view thereof, and FIG. 3 is an enlarged sectional view of an essential part thereof. The outer box 4 of this emergency power generator is formed with outer walls 5 on both side walls, ceiling, front and rear walls, inspection doors, etc., and is isolated from the outside A. It should be noted that it is conceivable that a floor is further formed, not depending on the illustrated example. In the inside B of the outer case 4 as described above, a prime mover 6 such as an oil type engine and a generator 7 that generates electricity by utilizing the rotation of the prime mover 6 are stored. The inner surface of the outer box 4 is covered with a sound absorbing material 8 such as glass wool or sponge, and the inner surface of the sound absorbing material 8 is formed with irregularities 9 that diffusely reflect sound waves. The unevenness 9 is formed in a substantially wavy shape.

The present invention has been described above. Then it becomes as follows. In the outer case 4 of this abnormal power generator, the unevenness 9 that diffusely reflects sound waves is formed on the indoor surface of the sound absorbing material 8 that covers the inner surface. Therefore, during use, most of the sound waves generated from the prime mover 6, the generator 7 and the like stored in the inside B are almost absorbed while passing through the sound absorbing material 8, and part of the sound wave It does not pass through and is reflected by the surface of the sound absorbing material 8 on the indoor side. Now, here, the sound wave reflected to the inside B side is greatly attenuated by being irregularly reflected by the unevenness 9 formed on the indoor surface of the sound absorbing material 8. Therefore, the outer case 4 of the emergency power generator has the following first and second configurations. First, the sound waves from the prime mover 6 and the generator 7 are absorbed on the one hand by the sound absorbing material 8 on the one hand, and on the other hand, the reflection to the inside B side is greatly attenuated. As a result, the noise of the prime mover 6, the generator 7, etc. is suppressed to a low level, and the external A is less likely to leak. Secondly, this is realized without increasing the wall thickness of the sound absorbing material 8 by forming the unevenness 9 on the indoor surface of the sound absorbing material 8.

[0009]

[Effect of the device]

 As described above, the outer casing of the emergency power generator according to the present invention exhibits the following effects by forming irregularities that diffusely reflect sound waves on the indoor surface of the sound absorbing material. That is, firstly, the soundproofing performance is improved and the noise of the prime mover, generator, etc. is less likely to leak to the outside. Secondly, since this is realized without increasing the wall thickness of the sound absorbing material, there is no structural limitation such as reducing the internal storage space. As described above, the problems existing in this type of conventional example are eliminated, and the effect of the present invention is remarkable and significant.

[Brief description of drawings]

FIG. 1 shows an embodiment of an emergency power generator according to the present invention,
FIG.

FIG. 2 is a side sectional view of the embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of the same embodiment.

FIG. 4 is an enlarged sectional view of a main part of a conventional example.

[Explanation of symbols]

 1 outer plate 2 sound absorbing material (conventional example) 3 flat surface 4 outer box 5 outer plate 6 prime mover 7 generator 8 sound absorbing material (of the present invention) 9 unevenness A outer B inside

Claims (1)

[Scope of utility model registration request] 1. An outer box of an emergency power generator in which a prime mover, a generator and the like are housed, the inner surface of which is covered with a sound absorbing material, and the inner surface of the sound absorbing material has irregularities that diffusely reflect sound waves. The outer casing of the emergency power generator, which is characterized in that